Manuscript Summary: Sometime during the last 20 years of the 15th century, this manuscript was copied and annotated by the humanist and well-known professor of Aristotelian philosophy in Padua, Nicolaus Leonicus Thomaeus (1456-1531). (He should not be confused with his contemporary Leoniceno Niccolò [1428-1524], a physician, philosopher and professor in Ferrara.) This manuscript has a key role in cultural history, as the texts by Theoprastus and most of the Aristotelian texts it contains served as the basis for the Aldine edition of 1497. Similarly, it served as the basis for the translation of Aristotle's Mechanica published by the manuscript's owner in 1525 in Venice. In the margin of the manuscript one can see the efforts of Nicolaus Thomaeus to devise figures to illustrate the translation. (and)